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condensation dripping off A coil

I have a two year old Trane air handler mounted in the downward flow position. There a large drops of condensation forming at the top of the evaporative coils and falling onto the fan housing and leaking out of the air handler. The coils appear clean and air flow doesn't seem to be the problem. Beyond applying a cleaning foam, is there a spray which will prevent the large drops from forming such as a surfactant?